Means for rectifying single-phase currents.



J. L; WOODBRDGE.. i i y MEANS FOR REGTIFYING SINGLE PHASE GURRBNTS. APPLIOATION FILED um', 190e. l

'- www mso, 1909.

Wl TNESSES:

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V with mv invention to supply direct current l fronrthe conductors 1-2, rotates the arma-1- for rectifying poly-phase currents where the -nating current in conductor 2.

'UNITED srnrns rajENT OFFICE.

JOSEPH LESTER WODBRIDGE, 0F PHILADELPHIA, PENNSYLVANIA'.

MEANS ron RECTIFYING SINGLE-PHASE CURRENTS.

l Specification of Lette'rs Patent. Patented Nov. 1909. Application med may 4, 190s. serial No.4 ao,as9.

To all rwhom it may concern: V

Be it known that I, JOSEPH L. VVooD- BRIDGE, a citizen of the United States, anda resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain newand useful Means for Rectiying Single-Phase Currents, of which the following is a specification.

My invention applies to. apparatus designed for rectif ing alternating currents and isparticulary adapted .for rectifyin A single phase currents. .lt vmay also be. use( currents on the different phases arc unequal.

ln my latcnt No. 880,705, issued to me under date of March 3rd, 1908,11 have de-.r scribed apparatus which may be used for i-'cctifying polyphase alternating currents.' It such apparatus is used for rectifyingsingle phase currents a unidirectional'pulsat-l ing current will be produced in the direct current circuit. In order to utilize this apparatus for producing a continuous instead of a pulsating direct current proportional to a single )hase alternating current, I have introducedl an improvement consisting princi? pally of a squirrel cage structure surrounding thc armature of the rectifier. Referring to the accompanying drawing A, is a source of single phase alternating current feeding the c1rcu1t 1, 2, towhich translating devices L are connected.

R, is a rectifier designed in accordance to the circuit 9-10 proportional to the alter- The rectier 'R consists of an armature B revolving in a stationary ring D of magneticl material such as iron. The armature is rovided with a winding whichisconnecte at two opposite points to the collector rings 3 and 4, and is also connected in the usual manner to the commutator C u on which bear two pail-of brushes 5 6 an Zn-8.l A synchronous motor M driven by current ture in synchronism with the electro-motiver force across said conductors.

A current transformer T is shown, having its primary winding connected in series with conductor 2, while its secondary winding is connected by suitable brushes to the collector rings 3 and 4. By this means alternating current is transmit-ted 'through the armature windin producing a single phase alternating el 1n ,the armature and in the ring D.

This alternating field ma -be resolved into two component rotating elds revolving in opposite directions'with respect 4to the armature. By reason of the synchronous rotation cage is madeu'p of conductors of low resistance in the usual manner. The eiect of that component of the alternating field which is revolved at twice the speed ofsynchronism is to produce currents in this squirrel cage, which will vhave the ci'ectl of neutralizin this field except for a very small resi um necessary to produce the elcctro-motive-force required to maintain the currents in the squirrel cage.` This residuum, being 'very small, may be neglected. There wil remain only that component .of

the field, which by reason of the rotation .of

the armature is held stationary in space.

Assume that this field component is located in the line joining the brushesr7-8. The eil'ect of thls field will be to produce an electromotiveforce between the brushes 5 and 6. These latter brushes are short-cir cuitcd so that a very small electro-motiveforce will cause a considerable fiow of curduces a second field displaced 90O from the first and this latter field will produce an electro-inotiveforce between the brushes 7 and 8. This' latter electro mot'veforce will cause a flow of current in the circuit 9-10 through any translating devices .which may rent between them. This latter current probe connected in that circuit such as P and Q.

This latter current will flow 4through'the armature winding between the brushes 7-8 in the direction to neutralize the stationary field produced by the alternating current and ,will neutralize it except for a small residuum necessary to produce' the electromotive-force and flow of current between the brushes 5 6. Any" increase in alternating current in conductor 2 wlll be accom panied by a corresponding increase in direct current in the circuit 9-10; -for if this latterincrease should not occur, the stationary lield produced by the alternating ..10 @hin l. a' may UNIL uw.

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